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Frictional connection - Geogrid and Concrete Retaining Wall

Frictional connection - Geogrid and Concrete Retaining Wall

Frictional connection - Geogrid and Concrete Retaining Wall

(OP)
I am in the process of designing a geogrid reinforced concrete Lock-Block retaining wall (some 5 m in height).  The geogrid will be attached to the wall through a frictional connection between each successive layer of blocks.  I was wondering if it was a wise choice to also specify a thin layer of sand between the blocks (nominal 25 mm/1 inch)and the grid to provide a more uniform frictional connection.  Or, does the weight of overlying blocks and the concrete surface on the grid generally provide an adequate frictional connection.  

RE: Frictional connection - Geogrid and Concrete Retaining Wall

Sand is not necessary.  I suggest contacting the manufacturer for pullout strengths.

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